Does a single redis client connection support concurrent read and write?

Question

I am very new to redis and this has always made me curious.

I am using a single redis client connection in nodejs (npm's redis package) which is included in each of my files.

Say for eg : File a.js is used for reading from mysql and inserting the data into redis hash ,file b.js reads from redis hash and outputs the result.

Now in a production environment i have a large numbers of request comming to b.js files which serves the content and in between i have a few request being made to a.js files to update the contents on the fly.

I want to know if a request to a.js slows down the already running redis connection in b.js.

Could you please select an answer and mark it as accepted? This will help other SO users that might have the same question as you. — lisa, May 07 '16 at 13:07

score 4 · Accepted Answer · edited May 23 '17 at 10:33

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Redis is single threaded, so if it's busy writing data, your reads will be delayed.

You'll find more information in this SO answer: Redis is single-threaded, then how does it do concurrent I/O?

edited May 23 '17 at 10:33

Community

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answered Apr 28 '16 at 09:36

lisa

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score 0 · Answer 2 · answered Apr 28 '16 at 09:34

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Redis is single threaded then there is no concurrent read/write. If there are 2 client connection sending command to the redis they will be queued.

Then yes if a.js send a lot of commands to the Redis, b.js commands will be inserted between a.js commands

answered Apr 28 '16 at 09:34

khanou

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How we can handle the concurrent requests in redis – Suraj Dalvi Jan 27 '21 at 11:35

score 0 · Answer 3 · answered May 06 '16 at 00:15

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No, the connection will not be slow down. What will slow down is the response time from redis. But I doubt you will notice as we are talking about a few micro-seconds per request.

answered May 06 '16 at 00:15

Does a single redis client connection support concurrent read and write?

3 Answers3